I would like to add a couple of definitions of belief to give more scope to what it is.
: a state or habit of mind in which trust or confidence is placed in some person or thing
: something that is accepted, considered to be true, or held as an opinion : something believed
merriam-webster
I also accept Pro's definition but find it's incomplete, it's part of belief, not the entire thing. He's referring to the feeling associated with belief, not the entirety of what believing is.
It is essential to realise that belief is not solely a feeling, it is also confidence in the truth-status of what is believed in. Once has to intellectually hold something as true. This is why 'choose to believe' is one of the most gaslighting concepts ever invented.
One does not choose to believe, one believes and than may choose to maintain said belief by confirmation bias.
To believe in God's existence is impossible for a being that never once received any evidence towards that existence.
Let's explore what evidence actually is.
I will accept Pro's definition and offer an alternative from Google's AI:
the available body of facts or information indicating whether a belief or proposition is true or valid.
This definition and Pro's mean that evidence is not solely physical. Evidence even is the facts, information and under Pro's definition the ideas and documents (which come under information but he added 'documents') that lead one to believe something is true.
In fact, the literal way to understand evidence is relative to belief. Since, evidence is a contingent thing. Without affecting belief in the truth or validity of something, evidence is standalone data. It is only the relevance to beliving something is true or not that makes data become evidence. This is also a 2-way relationship.
Belief does not occur without evidence. What is possible is with the exact same evidence, one person readily dismisses something as insane or a lie while the other accept it as true and valid. That does not mean that whichever of them is incorrect lacked evidence.
If I take an ant having 6 legs as evidence that all beings have 6 legs my belief would be wrong but still required evidence to ever believe it. If I take humans having hearts as proof of God and the miracle of life, even if that logical pathing does not make sense to atheists or even many theists, it still required some evidence for me to ever believe in God; in this case, it was the heart.
No matter what variant of believing in God you can come up with, belief in anything especially God requires evidence.
And yes, even believing that belief in God requires evidence itself requires evidence. That evidence is inside of what I am debating.